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From "Xiao-Feng Li" <xiaofeng...@gmail.com>
Subject [DRLVM][GC] first batch of files for GCv5, a preliminary trace-forward copying collector
Date Mon, 11 Sep 2006 15:35:21 GMT
Hi, folks, to follow up the GCv5 proposal, I submitted the early files
of a copying collector for GCv5. The idea is to develop GCv5 openly in
Harmony, so that we can develop it togother. Any comments or
improvements are welcome. The JIRA issue I created is HARMONY-1428 as
the message below. It has no document associated, since it's too early
and unstable for serious document efforts; but I think it is simple
and concise enough for any people who are interested in GC
development.

Thanks,
xiaofeng

---------- Forwarded message ----------
From: Xiao-Feng Li (JIRA) <jira@apache.org>
Date: Sep 11, 2006 11:20 PM
Subject: [jira] Created: (HARMONY-1428) [DRLVM] first batch of files
for GCv5, a trace-forward copying collector
To: xiaofeng.li@gmail.com


[DRLVM] first batch of files for GCv5, a trace-forward copying collector
------------------------------------------------------------------------

                 Key: HARMONY-1428
                 URL: http://issues.apache.org/jira/browse/HARMONY-1428
             Project: Harmony
          Issue Type: Improvement
          Components: DRLVM
         Environment: These files were only tested on Windows with VS.NET 2003.
            Reporter: Xiao-Feng Li


This archive has a couple of files implementing an early version of a
trace-forward copying collector for GCv5. It's only a starter with
very basic functionalities. It is a generational GC reqiures write
barrier implemented in JIT. It was tested with JET, and ran
SPECJBB2000 and SPECJVM98.

The algorithm is depth-first tracing of From-space, and forwarding
live objects to To-space (It can forward part of the From-space). The
To-space has no real management except for the accomodation of
forwarded objects and large objects. So the To-space is going to be
replaced by a mark-compaction GC, and the large objects will be
managed by a LOS GC.

In order to minimize the changes to other components of DRLVM, the
codes here comply with the original contract between GCv4 and other
components. I also borrowed some routine code from GCv4 to avoid
repetitive labor work.

GCv5 is under active development, so please expect quick and big
changes to this submitted code base. I will submit new codes from time
to time when they are worth a submission. Any comments or codes are
more than welcome.

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